US10612432B2 - Tribological system, comprising a valve seat ring and a valve - Google Patents

Tribological system, comprising a valve seat ring and a valve Download PDF

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US10612432B2
US10612432B2 US15/746,399 US201615746399A US10612432B2 US 10612432 B2 US10612432 B2 US 10612432B2 US 201615746399 A US201615746399 A US 201615746399A US 10612432 B2 US10612432 B2 US 10612432B2
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powder
valve
tribological system
hard phase
composition including
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US20180209311A1 (en
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Heiko Heckendorn
Peter Jaeggi
Roland Ruch
Roland Scholl
Klaus Wintrich
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Mahle International GmbH
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Mahle International GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • B22F2003/242—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment

Definitions

  • the invention relates to a tribological system comprising a valve seat ring made of sintered material and a valve that is untreated or hardened and or plated at least in the seat region.
  • valve and the associated valve seat ring which together form a tribological system. They seal the combustion chamber and control the exchange of gases in the engine.
  • the surfaces in this system that interact with and influence each other are exposed to extremely complex stresses caused by a cumulative load that prevails in a combustion engine consisting of mechanical, thermal, tribological and chemical stress.
  • each partner in the tribological system described above must also fulfill some conditions that apply only to itself.
  • valve seat ring must have high strength, in particular high resistance to deformation at moderately high temperatures (creep resistance), and high hot hardness, particularly since the outlet valves strike the valve seat more than 70 times per second.
  • valve seat rings must also have good thermal conductivity. Last but not least, good lubricity and wear resistance are also imperative requirements for valve seat rings.
  • Valve seat rings with the above properties are usually created by sintering a material that is designed for sintering.
  • the powder composition typically consists of a combination of a high-speed steel powder (such as the commercially widespread K3 or K1 powders) and one or more hard phases with Fe-base, optionally also Co-base, and other constituents such as solid lubricants, for instance sulfides, e.g., MoS 2 or K13, and/or graphite and/or copper and/or CaF 2 .
  • Such valve seat rings are often infiltrated with copper as well, to achieve a higher thermal conductivity and make them more easily workable.
  • a disadvantage of these valve seat ring materials is that they are often quite aggressive towards the counterpart element and so cause increased wear on the valve.
  • valves and in particular the valve discs, must have good heat resistance since they are exposed to temperatures of up to 1,000° C., and good wear resistance.
  • tribological systems in which the valve discs have not undergone any surface treatment.
  • An austenitic steel (JIS G 431 1: 21% Cr-4% Ni-9% Mn 0.4% N-0.5% C—Fe (the rest)), which is nitrided or plated with stellite F, 6 or 12 or with K8, K10, to enhance wear resistance and thereby improve the tribological properties of the system.
  • WO 2009 024 809 A1 discloses a material for a valve seat ring in which an iron-based alloy with reduced levels of the carbides of Mo, W, V and Nb is used. This powder constitutes the largest part of the powder mixture for processing. In addition, it still includes the conventional additives for improved processing, sintering, and solid lubricants and hard phases and copper.
  • a tribological system Besides the individual characteristics of each valve and valve seat ring, it is important for a tribological system to preserve the mechanical, physical and/or chemical interactions of the partners as minimal as possible. This is usually ensured by external lubrication via fuels, combustion products or the engine oil. If this external lubrication is reduced significantly or omitted entirely, the tribological system, which was previously exposed to a liquid or mixed friction, is increasingly exposed to a solid friction, which results in greater overall wear.
  • the object of the invention is to provide a tribological system comprising a valve seat ring and an untreated or a hardened and/or plated valve which avoids the disadvantages of the prior art, and in particular exhibits greater wear resistance and reduced overall wear.
  • the tribological system comprises a first tribological partner, that is to say a valve seat ring made from a sintered material, which is characterized in that the sintered material is obtainable by pressing and sintering a mixture of individual powder components comprising 5 to 45 wt % of one or more Fe-based hard phases and 0 to 2 wt % graphite particles and/or 0 to 2 wt % MnS powder and/or 0 to 2 wt % MoS 2 powder and/or up to 2 wt % FeP powder and/or 0 to 7 wt % Cu powder and/or 0 to 4% by weight Co powder and 0 to 1.0 wt % of a pressing additive, and the balance being high-speed steel powder having a composition of 14-18 wt % Cr, 1.2-1.9 wt % C, 0.1 to 0.9 wt % Si, 0.5 to 2.5 wt % V, 0.5 to 2.5
  • a second tribological partner specifically a valve of which the surface is untreated.
  • the second tribological partner is a valve that has been hardened and/or plated and/or nitrided at least in the seat region. Besides reduced wear in the tribological system, plating and/or nitriding the seat also helps to achieve improved sealing action of the valve during operation.
  • the valves are therefore preferably nitrided and/or plated in the seat area with a Fe-based or Co-based material.
  • the tribological system comprises a first tribological partner, that is to say a valve seat ring made from a sintered material, which is characterized in that the sintered material is obtainable by consolidating and sintering a mixture of individual powder components comprising 5 to 45 wt % of one or more Fe-based hard phases with a composition from 0 to 0.2 wt % C, 26 to 32 wt % Mo, 8 to 12 wt % Cr, 2.2 to 3 wt % Si and 0 to 2 wt % graphite particles and/or 0 to 2 wt % MnS powder and/or 0 to 2 wt % FeP powder and/or 0 to 2 wt % MoS 2 powder and/or 0 to 7 wt % Cu powder and/or 0 to 4 wt % Co powder, and 0.1-1.0 wt % of a pressing additive, and the balance being a powder similar to high
  • a second tribological partner specifically a valve of which the surface is untreated.
  • the second tribological partner is a valve that has been hardened and/or plated and/or nitrided at least in the seat region. Besides reduced wear in the tribological system, plating and/or nitriding the seat also helps to achieve improved sealing action of the valve during operation.
  • the valves are therefore preferably nitrided and/or plated in the seat area with a Fe-based or Co-based material.
  • the invention is based on the surprising discovery that with the described composition of materials in the valve seat ring, obtained by mixing the selected starting powders and skilful selection of the valve, tribological partners may be achieved in which the solid friction in the valve seat ring-valve system may be minimized, so that overall wear may also be reduced significantly.
  • valve guide besides the valve seat ring and the valve with disc and stem, the tribological system also extends to the valve guide. Particularly if the valve seat and valve stem untreated, that is to say no hardened, coated or plated, adapting the valve guide cannot be disregarded. A suitable material pairing of valve stem and valve guide is also required here as well.
  • the wear resistance of the tribological system according to the invention depends inter alia on the hardness and thickness of a nitriding diffusion layer formed at least in the seat region of the valve. The best results are obtained with a hardness >510 HV and a thickness >19 ⁇ m. It was also found that the wear resistance of the tribological system according to the invention depends inter alia on the coating type and coating thickness of a plating layer formed at least in the seat region of the valve. The best results are obtained with a layer thickness of the plating >400 ⁇ m and a Co content and/or Fe content of >40%.
  • Fe-based hard phases are less expensive than nickel and cobalt-based alloys and can be adjusted in targeted manner to specific applications by heat treatment.
  • carbon hardens the matrix and also forms hard carbides which increase wear resistance.
  • a further reduction of wear may be achieved if the Fe-based hard phase contains 26 to 32 wt % Mo, 8 to 12 wt % Cr and 2.2 to 3 wt % Si, preferably 26 to 32 wt % Mo, 14 to 20 wt % Cr and 2.9 to 4.2 wt % Si.
  • a Co-based hard phase is also added to the sintered material, preferably in a proportion of 0.5 to 9.9 wt %.
  • Preferred Fe-based hard phases are K11, K6, K7 and K4. Particularly preferred are K6 and K7.
  • Preferred Co-based hard phases, which are suitable for used in the described tribological system, are K8, K9 and K10, wherein K8 and K9 are particularly preferred. The composition of the hard phases will be explained below.
  • a microstructure can be adjusted in the valve seat ring in which the special carbides are formed significantly more coarsely in the sintered material than in conventional high-speed steels, for example.
  • suitable sintering parameters such as temperature, atmosphere or dewpoint
  • a microstructure can be adjusted in the valve seat ring in which the special carbides are formed significantly more coarsely in the sintered material than in conventional high-speed steels, for example.
  • the strength values measured in the compression test between 25 and 300° C. and described by the compressive yield Rd 0.2 of the sintered material are comparable.
  • the hot hardness is higher than that of the comparison materials.
  • the FIGURE illustrates results for total wear after engine testing under full load and a test duration of 100 hours, comparing the tribological system according to the present disclosure with comparison materials of Comparison 1 and Comparison 3.
  • Table 1 lists the compositions of a powder mixture according to the invention, “Invention”, and a comparison mixture, “Comparison 3”.
  • Production engineering and technical additives e.g. sulfides
  • Some examples of mixture components that were used or usable within the scope of the invention are summarized in Table 2 (Starting powder).
  • valve seat rings ( ⁇ a: 30 mm, ⁇ i: 23 mm; height: 6 mm).
  • a subset of the rings is sintered at a temperature from 1,110 to 1,125° C. (about 30 min) in N 2 —H 2 (17 to 25 vol % H 2 ) in a continuous furnace.
  • Another subset is subjected to sintering at 1,132 to 1,145° C. (approximately 30 minutes) in N 2 —H 2 (17 to 25 vol % H 2 ).
  • the maximum temperature during sintering was 1,132 to 1,145° C.
  • the hold time at the temperature indicated above was 20 to 33 minutes.
  • a mixture of N 2 —H 2 with an H 2 content of 17-25% was used for the sintering atmosphere.
  • the sintered material After sintering, the sintered material underwent heat treatment as summarized in Table 4 (Heat treatment). For this purpose, both simple tempering at temperatures between 550 and 620° C. and a quenching and tempering process, i.e. hardening at 850 to 950° C.—oil quenching—tempering at 510 to 610° C. were used. Since the differences in the properties, particularly in wear resistance, workability and creep properties are small, the tempered material is used.
  • a measurement of the special carbides found an average diameter of 2.1 ⁇ m in conventional comparative materials and 4.0 ⁇ m in the sintered material according to the invention.
  • the minimum and maximum values are given in addition to the average values in Table 5.
  • test results indicate total wear—after engine testing in the “Valve seat ring-Valve seat” tribological system, wherein valve seat rings made from the comparison materials “Comparison 1”, “Comparison 2” and “Comparison 3” were considered as well as the valve seat ring prepared according to the invention (“Invention”).
  • test results illustrate the improved performance of the tribological system “Invention” according to the invention.
  • a skilful combination of the production and composition of the sintered material according to the invention and by combining a valve that has been plated at least in the seat region with Stellite F the solid friction between tribological partners is reduced, thereby greatly lowering wear.
  • the measured total wear is reduced in this case.
  • valve seat ring in the “Comparison 1” tribological system consists of, in wt %: C: 1.5; S: 0.6; Cr: 3; Mo: 5 to 15; Cu: 10 to 20; V: 2; Fe: Balance; Other: 4.
  • “Comparison 2” is a Co-containing material which in addition to this expensive commodity also contains high levels of the refractory metals Mo and W.
  • the functional region consists of the elements in wt %: C: 0.5 to 2; Mn: 1; Cr: 3 to 6; Mo: 8 to 15; Co: 16 to 22; W: 2 to 5; V: 1 to 3; Cu: 12 to 22; Fe: Balance; Other: 3.
  • valve seat ring has the following composition in wt %: C: 0.5 to 1.5; Si: 0.2 to 10; Cr: 2.5-5; Mo: 5 to 8; W: 3-6; V: 1 to 4; Cu: 10 to 20; Fe: Balance; Other: 3 and in “Invention” the VSR has the composition: C: 1 to 1.8; Si: 0.2 to 1.8; Mn: 0.6; Cr: 10 to 15; Mo: 2.5 to 4.5; V: 0.4 to 10; Cu: 0.8 to 1: 5; Fe: Balance; Other: 3.
  • valve seat ring “Invention” contains significantly smaller amounts of expensive elements and achieves significantly lower overall wear.
  • Embodiment 1 Comparison 1, Comparison 3 and Invention
  • plated (F Stellite) and nitrided X50 valves are used as tribopartners
  • FIGURE total wear
  • valve seat materials described in Embodiment 1 exhibit very low total wear.
  • the wear on the valve seat ring and the valve disc is so low that it is not measurable.
  • Original machining marks are still visible. Since the material according to the invention is especially economical due to its use of small amounts of special carbides, a significant financial advantage over comparison material “Comparison 3” is obtained with comparable technical performance (overall wear not measurable).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Lift Valve (AREA)
US15/746,399 2015-07-21 2016-06-30 Tribological system, comprising a valve seat ring and a valve Active 2036-08-07 US10612432B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102015213706.6A DE102015213706A1 (de) 2015-07-21 2015-07-21 Tribologisches System, umfassend einen Ventilsitzring und ein Ventil
DE102015213706.6 2015-07-21
DE102015213706 2015-07-21
PCT/EP2016/065368 WO2017012841A1 (fr) 2015-07-21 2016-06-30 Système tribologique comprenant un siège de soupape rapporté et une soupape

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Publication Number Publication Date
US20180209311A1 US20180209311A1 (en) 2018-07-26
US10612432B2 true US10612432B2 (en) 2020-04-07

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US (1) US10612432B2 (fr)
EP (1) EP3325194B1 (fr)
JP (1) JP6767398B2 (fr)
DE (1) DE102015213706A1 (fr)
WO (1) WO2017012841A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP3406865B1 (fr) * 2017-03-28 2020-01-29 Kabushiki Kaisha Riken Siège de soupape fritté
RU2645530C1 (ru) * 2017-06-19 2018-02-21 Юлия Алексеевна Щепочкина Спеченный антифрикционный материал на основе железа
DE102017218123A1 (de) * 2017-10-11 2019-04-11 Mahle International Gmbh Verfahren zum Herstellen eines Ventilsitzrings auf pulvermetallurgischem Wege
CN108441744B (zh) * 2018-02-06 2020-04-21 湘潭大学 一种自润滑减摩耐磨合金材料及其制备方法
DE102018209682A1 (de) * 2018-06-15 2019-12-19 Mahle International Gmbh Verfahren zum Herstellen eines pulvermetallurgischen Erzeugnisses
DE102018219686A1 (de) * 2018-11-16 2020-05-20 Mahle International Gmbh Verfahren zum Herstellen eines mit Kupfer infiltrierten Ventilsitzrings
DE102020202737A1 (de) 2020-03-04 2021-09-09 Mahle International Gmbh Tribologisches System, Verfahren zum Herstellen eines tribologischen Systems und Brennkraftmaschine mit einem tribologischen System
CN113789482A (zh) * 2021-09-01 2021-12-14 安徽金亿新材料股份有限公司 一种高吸能嫦娥钢、气门座圈及其制备方法
FR3133331A1 (fr) * 2022-03-11 2023-09-15 Renault S.A.S Poudre en matériau composite métallique pour projection thermique et procédé de fabrication d’une première pièce sur une deuxième pièce à partir d’une telle poudre
US11959041B2 (en) * 2022-08-31 2024-04-16 Robert Bosch Gmbh Tribological system

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DE3935496C1 (en) 1989-10-25 1990-07-26 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De (Exhaust) valve of internal combustion engine - made at least completion of intermetallic phases of nickel and aluminium
EP0521821A2 (fr) 1991-07-04 1993-01-07 New Sulzer Diesel Ag Soupape d'échappement d'un moteur à combustion interne du type Diesel et son procédé de fabrication
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EP0946774B1 (fr) 1996-11-30 2004-04-21 Federal-Mogul Sintered Products Limited Poudre a base de fer
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GB615929A (en) * 1946-03-14 1949-01-13 Julio Villars Improvements in and relating to a lifting device
AU7704281A (en) * 1980-11-10 1982-05-20 Teledyne Industries, Inc. High speed steel
KR840006018A (ko) * 1982-09-06 1984-11-21 나가노 겡 동용침 철계소결합금 부재의 제조방법과 그 방법에 의하여 제조된 2층 밸브 시이트
DE3935496C1 (en) 1989-10-25 1990-07-26 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De (Exhaust) valve of internal combustion engine - made at least completion of intermetallic phases of nickel and aluminium
US5312475A (en) 1990-10-06 1994-05-17 Brico Engineering Ltd. Sintered material
EP0521821A2 (fr) 1991-07-04 1993-01-07 New Sulzer Diesel Ag Soupape d'échappement d'un moteur à combustion interne du type Diesel et son procédé de fabrication
EP0946774B1 (fr) 1996-11-30 2004-04-21 Federal-Mogul Sintered Products Limited Poudre a base de fer
US6082317A (en) 1997-06-27 2000-07-04 Nippon Piston Ring Co., Ltd. Valve seat for internal combustion engine
US6073912A (en) * 1997-08-07 2000-06-13 Fuji Oozx Inc. Al or Al alloy poppet valve and a method of manufacturing the same
US6318327B1 (en) * 1999-05-31 2001-11-20 Nippon Piston Ring Co., Ltd. Valve system for internal combustion engine
EP1108800A2 (fr) 1999-12-17 2001-06-20 Toyota Jidosha Kabushiki Kaisha Particules dures, alliage fritté à base de fer résistant à l'usure, son procédé de préparation, siège de soupape et culasse
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GB0615929D0 (en) * 2006-08-11 2006-09-20 Federal Mogul Sintered Prod Improved powder matallurgy composition
US20090252639A1 (en) 2006-09-22 2009-10-08 Höganäs Ab (Publ) Metallurgical powder composition and method of production
WO2009024809A1 (fr) 2007-08-17 2009-02-26 Federal-Mogul Sintered Products Limited Insert de siège de soupape et son procédé de production
WO2009040369A1 (fr) 2007-09-28 2009-04-02 Höganäs Ab (Publ) Composition de poudre métallurgique et son procédé de production
US20090092848A1 (en) * 2007-10-05 2009-04-09 Hitachi Powdered Metals Co., Ltd. Sintered composite sliding part and production method therefor
US20100101368A1 (en) * 2008-10-28 2010-04-29 Zhigang Zak Fang Functionally graded cemented tungsten carbide with engineered hard surface and the method for making the same
US20120288399A1 (en) * 2011-05-09 2012-11-15 Daido Steel Co., Ltd. High-hardness hardfacing alloy powder
EP2570507A1 (fr) * 2011-09-19 2013-03-20 Sandvik Intellectual Property AB Procédé de production d'acier à haute vitesse
US20130156555A1 (en) * 2011-12-15 2013-06-20 General Electric Company Braze materials, brazing processes, and components with wear-resistant coatings formed thereby
US20130259733A1 (en) * 2012-04-02 2013-10-03 Hyundai Motor Company Sintered alloy for valve seat and manufacturing method of exhaust valve seat using the same

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* Cited by examiner, † Cited by third party
Title
English abstract for EP-0521821.

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JP6767398B2 (ja) 2020-10-14
EP3325194B1 (fr) 2020-05-20
US20180209311A1 (en) 2018-07-26
DE102015213706A1 (de) 2017-01-26
JP2018529015A (ja) 2018-10-04
WO2017012841A1 (fr) 2017-01-26

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